gnome-vfs-extras 0.99.11 doesn't provide proper samba support in nautilus if the password is blank. It shows the machine's shares but can't open any of them - prompts for password in an endless loop or crashes nautilus if closed with the titlebar's close button. However, browsing shares protected by blank password with gnome-vfs-extras 0.99.10 installed works fine.
P.S. There seem to be other issues with 0.99.11 as well - http://forums.gentoo.org/viewtopic.php?t=85489&highlight=gnomevfsextras
not the same problem, but the same troublesome pack. *** This bug has been marked as a duplicate of 42146 ***